| 1 | /* Xtensa ELF support for BFD. |
| 2 | Copyright (C) 2003-2020 Free Software Foundation, Inc. |
| 3 | Contributed by Bob Wilson (bwilson@tensilica.com) at Tensilica. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, |
| 20 | USA. */ |
| 21 | |
| 22 | /* This file holds definitions specific to the Xtensa ELF ABI. */ |
| 23 | |
| 24 | #ifndef _ELF_XTENSA_H |
| 25 | #define _ELF_XTENSA_H |
| 26 | |
| 27 | #include "elf/reloc-macros.h" |
| 28 | |
| 29 | #ifdef __cplusplus |
| 30 | extern "C" { |
| 31 | #endif |
| 32 | |
| 33 | /* Relocations. */ |
| 34 | START_RELOC_NUMBERS (elf_xtensa_reloc_type) |
| 35 | RELOC_NUMBER (R_XTENSA_NONE, 0) |
| 36 | RELOC_NUMBER (R_XTENSA_32, 1) |
| 37 | RELOC_NUMBER (R_XTENSA_RTLD, 2) |
| 38 | RELOC_NUMBER (R_XTENSA_GLOB_DAT, 3) |
| 39 | RELOC_NUMBER (R_XTENSA_JMP_SLOT, 4) |
| 40 | RELOC_NUMBER (R_XTENSA_RELATIVE, 5) |
| 41 | RELOC_NUMBER (R_XTENSA_PLT, 6) |
| 42 | RELOC_NUMBER (R_XTENSA_OP0, 8) |
| 43 | RELOC_NUMBER (R_XTENSA_OP1, 9) |
| 44 | RELOC_NUMBER (R_XTENSA_OP2, 10) |
| 45 | RELOC_NUMBER (R_XTENSA_ASM_EXPAND, 11) |
| 46 | RELOC_NUMBER (R_XTENSA_ASM_SIMPLIFY, 12) |
| 47 | RELOC_NUMBER (R_XTENSA_32_PCREL, 14) |
| 48 | RELOC_NUMBER (R_XTENSA_GNU_VTINHERIT, 15) |
| 49 | RELOC_NUMBER (R_XTENSA_GNU_VTENTRY, 16) |
| 50 | RELOC_NUMBER (R_XTENSA_DIFF8, 17) |
| 51 | RELOC_NUMBER (R_XTENSA_DIFF16, 18) |
| 52 | RELOC_NUMBER (R_XTENSA_DIFF32, 19) |
| 53 | RELOC_NUMBER (R_XTENSA_SLOT0_OP, 20) |
| 54 | RELOC_NUMBER (R_XTENSA_SLOT1_OP, 21) |
| 55 | RELOC_NUMBER (R_XTENSA_SLOT2_OP, 22) |
| 56 | RELOC_NUMBER (R_XTENSA_SLOT3_OP, 23) |
| 57 | RELOC_NUMBER (R_XTENSA_SLOT4_OP, 24) |
| 58 | RELOC_NUMBER (R_XTENSA_SLOT5_OP, 25) |
| 59 | RELOC_NUMBER (R_XTENSA_SLOT6_OP, 26) |
| 60 | RELOC_NUMBER (R_XTENSA_SLOT7_OP, 27) |
| 61 | RELOC_NUMBER (R_XTENSA_SLOT8_OP, 28) |
| 62 | RELOC_NUMBER (R_XTENSA_SLOT9_OP, 29) |
| 63 | RELOC_NUMBER (R_XTENSA_SLOT10_OP, 30) |
| 64 | RELOC_NUMBER (R_XTENSA_SLOT11_OP, 31) |
| 65 | RELOC_NUMBER (R_XTENSA_SLOT12_OP, 32) |
| 66 | RELOC_NUMBER (R_XTENSA_SLOT13_OP, 33) |
| 67 | RELOC_NUMBER (R_XTENSA_SLOT14_OP, 34) |
| 68 | RELOC_NUMBER (R_XTENSA_SLOT0_ALT, 35) |
| 69 | RELOC_NUMBER (R_XTENSA_SLOT1_ALT, 36) |
| 70 | RELOC_NUMBER (R_XTENSA_SLOT2_ALT, 37) |
| 71 | RELOC_NUMBER (R_XTENSA_SLOT3_ALT, 38) |
| 72 | RELOC_NUMBER (R_XTENSA_SLOT4_ALT, 39) |
| 73 | RELOC_NUMBER (R_XTENSA_SLOT5_ALT, 40) |
| 74 | RELOC_NUMBER (R_XTENSA_SLOT6_ALT, 41) |
| 75 | RELOC_NUMBER (R_XTENSA_SLOT7_ALT, 42) |
| 76 | RELOC_NUMBER (R_XTENSA_SLOT8_ALT, 43) |
| 77 | RELOC_NUMBER (R_XTENSA_SLOT9_ALT, 44) |
| 78 | RELOC_NUMBER (R_XTENSA_SLOT10_ALT, 45) |
| 79 | RELOC_NUMBER (R_XTENSA_SLOT11_ALT, 46) |
| 80 | RELOC_NUMBER (R_XTENSA_SLOT12_ALT, 47) |
| 81 | RELOC_NUMBER (R_XTENSA_SLOT13_ALT, 48) |
| 82 | RELOC_NUMBER (R_XTENSA_SLOT14_ALT, 49) |
| 83 | RELOC_NUMBER (R_XTENSA_TLSDESC_FN, 50) |
| 84 | RELOC_NUMBER (R_XTENSA_TLSDESC_ARG, 51) |
| 85 | RELOC_NUMBER (R_XTENSA_TLS_DTPOFF, 52) |
| 86 | RELOC_NUMBER (R_XTENSA_TLS_TPOFF, 53) |
| 87 | RELOC_NUMBER (R_XTENSA_TLS_FUNC, 54) |
| 88 | RELOC_NUMBER (R_XTENSA_TLS_ARG, 55) |
| 89 | RELOC_NUMBER (R_XTENSA_TLS_CALL, 56) |
| 90 | RELOC_NUMBER (R_XTENSA_PDIFF8, 57) |
| 91 | RELOC_NUMBER (R_XTENSA_PDIFF16, 58) |
| 92 | RELOC_NUMBER (R_XTENSA_PDIFF32, 59) |
| 93 | RELOC_NUMBER (R_XTENSA_NDIFF8, 60) |
| 94 | RELOC_NUMBER (R_XTENSA_NDIFF16, 61) |
| 95 | RELOC_NUMBER (R_XTENSA_NDIFF32, 62) |
| 96 | END_RELOC_NUMBERS (R_XTENSA_max) |
| 97 | |
| 98 | /* Processor-specific flags for the ELF header e_flags field. */ |
| 99 | |
| 100 | /* Four-bit Xtensa machine type field. */ |
| 101 | #define EF_XTENSA_MACH 0x0000000f |
| 102 | |
| 103 | /* Various CPU types. */ |
| 104 | #define E_XTENSA_MACH 0x00000000 |
| 105 | |
| 106 | /* Leave bits 0xf0 alone in case we ever have more than 16 cpu types. |
| 107 | Highly unlikely, but what the heck. */ |
| 108 | |
| 109 | #define EF_XTENSA_XT_INSN 0x00000100 |
| 110 | #define EF_XTENSA_XT_LIT 0x00000200 |
| 111 | |
| 112 | |
| 113 | /* Processor-specific dynamic array tags. */ |
| 114 | |
| 115 | /* Offset of the table that records the GOT location(s). */ |
| 116 | #define DT_XTENSA_GOT_LOC_OFF 0x70000000 |
| 117 | |
| 118 | /* Number of entries in the GOT location table. */ |
| 119 | #define DT_XTENSA_GOT_LOC_SZ 0x70000001 |
| 120 | |
| 121 | |
| 122 | /* Definitions for instruction and literal property tables. The |
| 123 | tables for ".gnu.linkonce.*" sections are placed in the following |
| 124 | sections: |
| 125 | |
| 126 | instruction tables: .gnu.linkonce.x.* |
| 127 | literal tables: .gnu.linkonce.p.* |
| 128 | */ |
| 129 | |
| 130 | #define XTENSA_INSN_SEC_NAME ".xt.insn" |
| 131 | #define XTENSA_LIT_SEC_NAME ".xt.lit" |
| 132 | #define XTENSA_PROP_SEC_NAME ".xt.prop" |
| 133 | |
| 134 | typedef struct property_table_entry_t |
| 135 | { |
| 136 | bfd_vma address; |
| 137 | bfd_vma size; |
| 138 | flagword flags; |
| 139 | } property_table_entry; |
| 140 | |
| 141 | /* Flags in the property tables to specify whether blocks of memory are |
| 142 | literals, instructions, data, or unreachable. For instructions, |
| 143 | blocks that begin loop targets and branch targets are designated. |
| 144 | Blocks that do not allow density instructions, instruction reordering |
| 145 | or transformation are also specified. Finally, for branch targets, |
| 146 | branch target alignment priority is included. Alignment of the next |
| 147 | block is specified in the current block and the size of the current |
| 148 | block does not include any fill required to align to the next |
| 149 | block. */ |
| 150 | |
| 151 | #define XTENSA_PROP_LITERAL 0x00000001 |
| 152 | #define XTENSA_PROP_INSN 0x00000002 |
| 153 | #define XTENSA_PROP_DATA 0x00000004 |
| 154 | #define XTENSA_PROP_UNREACHABLE 0x00000008 |
| 155 | /* Instruction-only properties at beginning of code. */ |
| 156 | #define XTENSA_PROP_INSN_LOOP_TARGET 0x00000010 |
| 157 | #define XTENSA_PROP_INSN_BRANCH_TARGET 0x00000020 |
| 158 | /* Instruction-only properties about code. */ |
| 159 | #define XTENSA_PROP_INSN_NO_DENSITY 0x00000040 |
| 160 | #define XTENSA_PROP_INSN_NO_REORDER 0x00000080 |
| 161 | /* Historically, NO_TRANSFORM was a property of instructions, |
| 162 | but it should apply to literals under certain circumstances. */ |
| 163 | #define XTENSA_PROP_NO_TRANSFORM 0x00000100 |
| 164 | |
| 165 | /* Branch target alignment information. This transmits information |
| 166 | to the linker optimization about the priority of aligning a |
| 167 | particular block for branch target alignment: None, low priority, |
| 168 | high priority, or required. These only need to be checked in |
| 169 | instruction blocks marked as XTENSA_PROP_INSN_BRANCH_TARGET. |
| 170 | Common usage is: |
| 171 | |
| 172 | switch (GET_XTENSA_PROP_BT_ALIGN(flags)) |
| 173 | case XTENSA_PROP_BT_ALIGN_NONE: |
| 174 | case XTENSA_PROP_BT_ALIGN_LOW: |
| 175 | case XTENSA_PROP_BT_ALIGN_HIGH: |
| 176 | case XTENSA_PROP_BT_ALIGN_REQUIRE: |
| 177 | */ |
| 178 | #define XTENSA_PROP_BT_ALIGN_MASK 0x00000600 |
| 179 | |
| 180 | /* No branch target alignment. */ |
| 181 | #define XTENSA_PROP_BT_ALIGN_NONE 0x0 |
| 182 | /* Low priority branch target alignment. */ |
| 183 | #define XTENSA_PROP_BT_ALIGN_LOW 0x1 |
| 184 | /* High priority branch target alignment. */ |
| 185 | #define XTENSA_PROP_BT_ALIGN_HIGH 0x2 |
| 186 | /* Required branch target alignment. */ |
| 187 | #define XTENSA_PROP_BT_ALIGN_REQUIRE 0x3 |
| 188 | |
| 189 | #define GET_XTENSA_PROP_BT_ALIGN(flag) \ |
| 190 | (((unsigned)((flag) & (XTENSA_PROP_BT_ALIGN_MASK))) >> 9) |
| 191 | #define SET_XTENSA_PROP_BT_ALIGN(flag, align) \ |
| 192 | (((flag) & (~XTENSA_PROP_BT_ALIGN_MASK)) | \ |
| 193 | (((align) << 9) & XTENSA_PROP_BT_ALIGN_MASK)) |
| 194 | |
| 195 | /* Alignment is specified in the block BEFORE the one that needs |
| 196 | alignment. Up to 5 bits. Use GET_XTENSA_PROP_ALIGNMENT(flags) to |
| 197 | get the required alignment specified as a power of 2. Use |
| 198 | SET_XTENSA_PROP_ALIGNMENT(flags, pow2) to set the required |
| 199 | alignment. Be careful of side effects since the SET will evaluate |
| 200 | flags twice. Also, note that the SIZE of a block in the property |
| 201 | table does not include the alignment size, so the alignment fill |
| 202 | must be calculated to determine if two blocks are contiguous. |
| 203 | TEXT_ALIGN is not currently implemented but is a placeholder for a |
| 204 | possible future implementation. */ |
| 205 | |
| 206 | #define XTENSA_PROP_ALIGN 0x00000800 |
| 207 | |
| 208 | #define XTENSA_PROP_ALIGNMENT_MASK 0x0001f000 |
| 209 | |
| 210 | #define GET_XTENSA_PROP_ALIGNMENT(flag) \ |
| 211 | (((unsigned)((flag) & (XTENSA_PROP_ALIGNMENT_MASK))) >> 12) |
| 212 | #define SET_XTENSA_PROP_ALIGNMENT(flag, align) \ |
| 213 | (((flag) & (~XTENSA_PROP_ALIGNMENT_MASK)) | \ |
| 214 | (((align) << 12) & XTENSA_PROP_ALIGNMENT_MASK)) |
| 215 | |
| 216 | #define XTENSA_PROP_INSN_ABSLIT 0x00020000 |
| 217 | |
| 218 | extern asection *xtensa_make_property_section (asection *, const char *); |
| 219 | extern int |
| 220 | xtensa_read_table_entries (bfd *abfd, |
| 221 | asection *section, |
| 222 | property_table_entry **table_p, |
| 223 | const char *sec_name, |
| 224 | bfd_boolean output_addr); |
| 225 | extern int |
| 226 | xtensa_compute_fill_extra_space (property_table_entry *entry); |
| 227 | |
| 228 | extern int |
| 229 | xtensa_abi_choice (void); |
| 230 | |
| 231 | #ifdef __cplusplus |
| 232 | } |
| 233 | #endif |
| 234 | |
| 235 | #endif /* _ELF_XTENSA_H */ |